681898320 has 240 divisors, whose sum is σ = 2391846912. Its totient is φ = 173905920.

The previous prime is 681898313. The next prime is 681898363. The reversal of 681898320 is 23898186.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3057729 + ... + 3057951.

Almost surely, 2^681898320 is an apocalyptic number.

681898320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681898320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1195923456).

681898320 is an abundant number, since it is smaller than the sum of its proper divisors (1709948592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681898320 is a wasteful number, since it uses less digits than its factorization.

681898320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 681898320 is about 26113.1828776195. The cubic root of 681898320 is about 880.1834672567.

The spelling of 681898320 in words is "six hundred eighty-one million, eight hundred ninety-eight thousand, three hundred twenty".